Soiling effect on the incidence of solar inrradiance on photovoltaic array plane

This paper proposes a new correction of parameters used to improve the Hottel model of solar irradiation on photovoltaic array plane. Our model has been experimentally validated for two different climatic sites in Algeria (at the seaside and desert). The test on a photovoltaic generator (with and without dust on surface) were performed in a desert area. These test show that the soiling affect the irradiance incidence on photovoltaic array plane, especially during tow time intervals of before and after noon.